package com.steven.concurrent;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimplePriorities implements Runnable {
	private int countDown = 5;
	private volatile double d;
	private int priority;
	
	public SimplePriorities(int priority) {
		this.priority = priority;
	}
	
	@Override
	public String toString() {
		return Thread.currentThread() + ": " + countDown;
	}
	@Override
	public void run() {
		Thread.currentThread().setPriority(priority);
		while(true) {
			for (int i=1; i<10000; i++){
				d += (Math.PI + Math.E) / (double)i;
				if (i % 1000 == 0) {
					Thread.yield();
				}
			}
			System.out.println(this);
			if (--countDown == 0) {
				return;
			}
		}
	}
	
	public static void main(String[] args) {
		ExecutorService exec = Executors.newCachedThreadPool();
		for (int i=0; i<5; i++) { 
			exec.execute(new SimplePriorities(Thread.MIN_PRIORITY));
		}
		exec.execute(new SimplePriorities(Thread.MAX_PRIORITY));
		exec.shutdown();
	}

}
